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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/transport.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 | 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
14a441a2 | 6 | * Jeremy Allison (jra@samba.org) 2006. |
79a58d1f | 7 | * |
1da177e4 LT |
8 | * This library is free software; you can redistribute it and/or modify |
9 | * it under the terms of the GNU Lesser General Public License as published | |
10 | * by the Free Software Foundation; either version 2.1 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
16 | * the GNU Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, write to the Free Software | |
79a58d1f | 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
21 | */ |
22 | ||
23 | #include <linux/fs.h> | |
24 | #include <linux/list.h> | |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 LT |
26 | #include <linux/wait.h> |
27 | #include <linux/net.h> | |
28 | #include <linux/delay.h> | |
f06ac72e | 29 | #include <linux/freezer.h> |
b8eed283 | 30 | #include <linux/tcp.h> |
2f8b5444 | 31 | #include <linux/bvec.h> |
97bc00b3 | 32 | #include <linux/highmem.h> |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 LT |
34 | #include <asm/processor.h> |
35 | #include <linux/mempool.h> | |
b30c74c7 | 36 | #include <linux/signal.h> |
1da177e4 LT |
37 | #include "cifspdu.h" |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_debug.h" | |
8bd68c6e | 41 | #include "smb2proto.h" |
9762c2d0 | 42 | #include "smbdirect.h" |
50c2f753 | 43 | |
3cecf486 RS |
44 | /* Max number of iovectors we can use off the stack when sending requests. */ |
45 | #define CIFS_MAX_IOV_SIZE 8 | |
46 | ||
2dc7e1c0 PS |
47 | void |
48 | cifs_wake_up_task(struct mid_q_entry *mid) | |
2b84a36c JL |
49 | { |
50 | wake_up_process(mid->callback_data); | |
51 | } | |
52 | ||
a6827c18 | 53 | struct mid_q_entry * |
24b9b06b | 54 | AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server) |
1da177e4 LT |
55 | { |
56 | struct mid_q_entry *temp; | |
57 | ||
24b9b06b | 58 | if (server == NULL) { |
f96637be | 59 | cifs_dbg(VFS, "Null TCP session in AllocMidQEntry\n"); |
1da177e4 LT |
60 | return NULL; |
61 | } | |
50c2f753 | 62 | |
232087cb | 63 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
a6f74e80 | 64 | memset(temp, 0, sizeof(struct mid_q_entry)); |
696e420b | 65 | kref_init(&temp->refcount); |
a6f74e80 N |
66 | temp->mid = get_mid(smb_buffer); |
67 | temp->pid = current->pid; | |
68 | temp->command = cpu_to_le16(smb_buffer->Command); | |
69 | cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command); | |
1047abc1 | 70 | /* do_gettimeofday(&temp->when_sent);*/ /* easier to use jiffies */ |
a6f74e80 N |
71 | /* when mid allocated can be before when sent */ |
72 | temp->when_alloc = jiffies; | |
73 | temp->server = server; | |
2b84a36c | 74 | |
a6f74e80 N |
75 | /* |
76 | * The default is for the mid to be synchronous, so the | |
77 | * default callback just wakes up the current task. | |
78 | */ | |
79 | temp->callback = cifs_wake_up_task; | |
80 | temp->callback_data = current; | |
1da177e4 | 81 | |
1da177e4 | 82 | atomic_inc(&midCount); |
7c9421e1 | 83 | temp->mid_state = MID_REQUEST_ALLOCATED; |
1da177e4 LT |
84 | return temp; |
85 | } | |
86 | ||
696e420b LP |
87 | static void _cifs_mid_q_entry_release(struct kref *refcount) |
88 | { | |
89 | struct mid_q_entry *mid = container_of(refcount, struct mid_q_entry, | |
90 | refcount); | |
91 | ||
92 | mempool_free(mid, cifs_mid_poolp); | |
93 | } | |
94 | ||
95 | void cifs_mid_q_entry_release(struct mid_q_entry *midEntry) | |
96 | { | |
97 | spin_lock(&GlobalMid_Lock); | |
98 | kref_put(&midEntry->refcount, _cifs_mid_q_entry_release); | |
99 | spin_unlock(&GlobalMid_Lock); | |
100 | } | |
101 | ||
766fdbb5 | 102 | void |
1da177e4 LT |
103 | DeleteMidQEntry(struct mid_q_entry *midEntry) |
104 | { | |
1047abc1 | 105 | #ifdef CONFIG_CIFS_STATS2 |
2dc7e1c0 | 106 | __le16 command = midEntry->server->vals->lock_cmd; |
1047abc1 SF |
107 | unsigned long now; |
108 | #endif | |
7c9421e1 | 109 | midEntry->mid_state = MID_FREE; |
8097531a | 110 | atomic_dec(&midCount); |
7c9421e1 | 111 | if (midEntry->large_buf) |
b8643e1b SF |
112 | cifs_buf_release(midEntry->resp_buf); |
113 | else | |
114 | cifs_small_buf_release(midEntry->resp_buf); | |
1047abc1 SF |
115 | #ifdef CONFIG_CIFS_STATS2 |
116 | now = jiffies; | |
00778e22 SF |
117 | /* |
118 | * commands taking longer than one second (default) can be indications | |
119 | * that something is wrong, unless it is quite a slow link or a very | |
120 | * busy server. Note that this calc is unlikely or impossible to wrap | |
121 | * as long as slow_rsp_threshold is not set way above recommended max | |
122 | * value (32767 ie 9 hours) and is generally harmless even if wrong | |
123 | * since only affects debug counters - so leaving the calc as simple | |
124 | * comparison rather than doing multiple conversions and overflow | |
125 | * checks | |
126 | */ | |
127 | if ((slow_rsp_threshold != 0) && | |
128 | time_after(now, midEntry->when_alloc + (slow_rsp_threshold * HZ)) && | |
020eec5f | 129 | (midEntry->command != command)) { |
f5942db5 SF |
130 | /* |
131 | * smb2slowcmd[NUMBER_OF_SMB2_COMMANDS] counts by command | |
132 | * NB: le16_to_cpu returns unsigned so can not be negative below | |
133 | */ | |
134 | if (le16_to_cpu(midEntry->command) < NUMBER_OF_SMB2_COMMANDS) | |
468d6779 SF |
135 | cifs_stats_inc(&midEntry->server->smb2slowcmd[le16_to_cpu(midEntry->command)]); |
136 | ||
020eec5f SF |
137 | trace_smb3_slow_rsp(le16_to_cpu(midEntry->command), |
138 | midEntry->mid, midEntry->pid, | |
139 | midEntry->when_sent, midEntry->when_received); | |
140 | if (cifsFYI & CIFS_TIMER) { | |
0b456f04 | 141 | pr_debug(" CIFS slow rsp: cmd %d mid %llu", |
1047abc1 | 142 | midEntry->command, midEntry->mid); |
f80eaedd | 143 | cifs_info(" A: 0x%lx S: 0x%lx R: 0x%lx\n", |
1047abc1 SF |
144 | now - midEntry->when_alloc, |
145 | now - midEntry->when_sent, | |
146 | now - midEntry->when_received); | |
147 | } | |
148 | } | |
149 | #endif | |
696e420b | 150 | cifs_mid_q_entry_release(midEntry); |
1da177e4 LT |
151 | } |
152 | ||
3c1bf7e4 PS |
153 | void |
154 | cifs_delete_mid(struct mid_q_entry *mid) | |
ddc8cf8f JL |
155 | { |
156 | spin_lock(&GlobalMid_Lock); | |
ddf83afb RS |
157 | list_del_init(&mid->qhead); |
158 | mid->mid_flags |= MID_DELETED; | |
ddc8cf8f JL |
159 | spin_unlock(&GlobalMid_Lock); |
160 | ||
161 | DeleteMidQEntry(mid); | |
162 | } | |
163 | ||
6f49f46b JL |
164 | /* |
165 | * smb_send_kvec - send an array of kvecs to the server | |
166 | * @server: Server to send the data to | |
3ab3f2a1 | 167 | * @smb_msg: Message to send |
6f49f46b JL |
168 | * @sent: amount of data sent on socket is stored here |
169 | * | |
170 | * Our basic "send data to server" function. Should be called with srv_mutex | |
171 | * held. The caller is responsible for handling the results. | |
172 | */ | |
d6e04ae6 | 173 | static int |
3ab3f2a1 AV |
174 | smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg, |
175 | size_t *sent) | |
1da177e4 LT |
176 | { |
177 | int rc = 0; | |
3ab3f2a1 | 178 | int retries = 0; |
edf1ae40 | 179 | struct socket *ssocket = server->ssocket; |
50c2f753 | 180 | |
6f49f46b JL |
181 | *sent = 0; |
182 | ||
3ab3f2a1 AV |
183 | smb_msg->msg_name = (struct sockaddr *) &server->dstaddr; |
184 | smb_msg->msg_namelen = sizeof(struct sockaddr); | |
185 | smb_msg->msg_control = NULL; | |
186 | smb_msg->msg_controllen = 0; | |
0496e02d | 187 | if (server->noblocksnd) |
3ab3f2a1 | 188 | smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL; |
edf1ae40 | 189 | else |
3ab3f2a1 | 190 | smb_msg->msg_flags = MSG_NOSIGNAL; |
1da177e4 | 191 | |
3ab3f2a1 | 192 | while (msg_data_left(smb_msg)) { |
6f49f46b JL |
193 | /* |
194 | * If blocking send, we try 3 times, since each can block | |
195 | * for 5 seconds. For nonblocking we have to try more | |
196 | * but wait increasing amounts of time allowing time for | |
197 | * socket to clear. The overall time we wait in either | |
198 | * case to send on the socket is about 15 seconds. | |
199 | * Similarly we wait for 15 seconds for a response from | |
200 | * the server in SendReceive[2] for the server to send | |
201 | * a response back for most types of requests (except | |
202 | * SMB Write past end of file which can be slow, and | |
203 | * blocking lock operations). NFS waits slightly longer | |
204 | * than CIFS, but this can make it take longer for | |
205 | * nonresponsive servers to be detected and 15 seconds | |
206 | * is more than enough time for modern networks to | |
207 | * send a packet. In most cases if we fail to send | |
208 | * after the retries we will kill the socket and | |
209 | * reconnect which may clear the network problem. | |
210 | */ | |
3ab3f2a1 | 211 | rc = sock_sendmsg(ssocket, smb_msg); |
ce6c44e4 | 212 | if (rc == -EAGAIN) { |
3ab3f2a1 AV |
213 | retries++; |
214 | if (retries >= 14 || | |
215 | (!server->noblocksnd && (retries > 2))) { | |
f96637be JP |
216 | cifs_dbg(VFS, "sends on sock %p stuck for 15 seconds\n", |
217 | ssocket); | |
3ab3f2a1 | 218 | return -EAGAIN; |
1da177e4 | 219 | } |
3ab3f2a1 | 220 | msleep(1 << retries); |
1da177e4 LT |
221 | continue; |
222 | } | |
6f49f46b | 223 | |
79a58d1f | 224 | if (rc < 0) |
3ab3f2a1 | 225 | return rc; |
6f49f46b | 226 | |
79a58d1f | 227 | if (rc == 0) { |
3e84469d SF |
228 | /* should never happen, letting socket clear before |
229 | retrying is our only obvious option here */ | |
f96637be | 230 | cifs_dbg(VFS, "tcp sent no data\n"); |
3e84469d SF |
231 | msleep(500); |
232 | continue; | |
d6e04ae6 | 233 | } |
6f49f46b | 234 | |
3ab3f2a1 AV |
235 | /* send was at least partially successful */ |
236 | *sent += rc; | |
237 | retries = 0; /* in case we get ENOSPC on the next send */ | |
1da177e4 | 238 | } |
3ab3f2a1 | 239 | return 0; |
97bc00b3 JL |
240 | } |
241 | ||
35e2cc1b | 242 | unsigned long |
81f39f95 | 243 | smb_rqst_len(struct TCP_Server_Info *server, struct smb_rqst *rqst) |
a26054d1 JL |
244 | { |
245 | unsigned int i; | |
35e2cc1b PA |
246 | struct kvec *iov; |
247 | int nvec; | |
a26054d1 JL |
248 | unsigned long buflen = 0; |
249 | ||
81f39f95 RS |
250 | if (server->vals->header_preamble_size == 0 && |
251 | rqst->rq_nvec >= 2 && rqst->rq_iov[0].iov_len == 4) { | |
35e2cc1b PA |
252 | iov = &rqst->rq_iov[1]; |
253 | nvec = rqst->rq_nvec - 1; | |
254 | } else { | |
255 | iov = rqst->rq_iov; | |
256 | nvec = rqst->rq_nvec; | |
257 | } | |
258 | ||
a26054d1 | 259 | /* total up iov array first */ |
35e2cc1b | 260 | for (i = 0; i < nvec; i++) |
a26054d1 JL |
261 | buflen += iov[i].iov_len; |
262 | ||
c06a0f2d LL |
263 | /* |
264 | * Add in the page array if there is one. The caller needs to make | |
265 | * sure rq_offset and rq_tailsz are set correctly. If a buffer of | |
266 | * multiple pages ends at page boundary, rq_tailsz needs to be set to | |
267 | * PAGE_SIZE. | |
268 | */ | |
a26054d1 | 269 | if (rqst->rq_npages) { |
c06a0f2d LL |
270 | if (rqst->rq_npages == 1) |
271 | buflen += rqst->rq_tailsz; | |
272 | else { | |
273 | /* | |
274 | * If there is more than one page, calculate the | |
275 | * buffer length based on rq_offset and rq_tailsz | |
276 | */ | |
277 | buflen += rqst->rq_pagesz * (rqst->rq_npages - 1) - | |
278 | rqst->rq_offset; | |
279 | buflen += rqst->rq_tailsz; | |
280 | } | |
a26054d1 JL |
281 | } |
282 | ||
283 | return buflen; | |
284 | } | |
285 | ||
6f49f46b | 286 | static int |
07cd952f RS |
287 | __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
288 | struct smb_rqst *rqst) | |
6f49f46b | 289 | { |
07cd952f RS |
290 | int rc = 0; |
291 | struct kvec *iov; | |
292 | int n_vec; | |
293 | unsigned int send_length = 0; | |
294 | unsigned int i, j; | |
b30c74c7 | 295 | sigset_t mask, oldmask; |
3ab3f2a1 | 296 | size_t total_len = 0, sent, size; |
b8eed283 | 297 | struct socket *ssocket = server->ssocket; |
3ab3f2a1 | 298 | struct msghdr smb_msg; |
b8eed283 | 299 | int val = 1; |
c713c877 RS |
300 | __be32 rfc1002_marker; |
301 | ||
9762c2d0 | 302 | if (cifs_rdma_enabled(server) && server->smbd_conn) { |
81f39f95 | 303 | rc = smbd_send(server, rqst); |
9762c2d0 LL |
304 | goto smbd_done; |
305 | } | |
afc18a6f | 306 | |
ea702b80 | 307 | if (ssocket == NULL) |
afc18a6f | 308 | return -EAGAIN; |
ea702b80 | 309 | |
b30c74c7 PS |
310 | if (signal_pending(current)) { |
311 | cifs_dbg(FYI, "signal is pending before sending any data\n"); | |
312 | return -EINTR; | |
313 | } | |
314 | ||
b8eed283 JL |
315 | /* cork the socket */ |
316 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
317 | (char *)&val, sizeof(val)); | |
318 | ||
07cd952f | 319 | for (j = 0; j < num_rqst; j++) |
81f39f95 | 320 | send_length += smb_rqst_len(server, &rqst[j]); |
07cd952f RS |
321 | rfc1002_marker = cpu_to_be32(send_length); |
322 | ||
b30c74c7 PS |
323 | /* |
324 | * We should not allow signals to interrupt the network send because | |
325 | * any partial send will cause session reconnects thus increasing | |
326 | * latency of system calls and overload a server with unnecessary | |
327 | * requests. | |
328 | */ | |
329 | ||
330 | sigfillset(&mask); | |
331 | sigprocmask(SIG_BLOCK, &mask, &oldmask); | |
332 | ||
c713c877 RS |
333 | /* Generate a rfc1002 marker for SMB2+ */ |
334 | if (server->vals->header_preamble_size == 0) { | |
335 | struct kvec hiov = { | |
336 | .iov_base = &rfc1002_marker, | |
337 | .iov_len = 4 | |
338 | }; | |
aa563d7b | 339 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, &hiov, 1, 4); |
c713c877 RS |
340 | rc = smb_send_kvec(server, &smb_msg, &sent); |
341 | if (rc < 0) | |
b30c74c7 | 342 | goto unmask; |
c713c877 RS |
343 | |
344 | total_len += sent; | |
345 | send_length += 4; | |
346 | } | |
347 | ||
662bf5bc PA |
348 | cifs_dbg(FYI, "Sending smb: smb_len=%u\n", send_length); |
349 | ||
07cd952f RS |
350 | for (j = 0; j < num_rqst; j++) { |
351 | iov = rqst[j].rq_iov; | |
352 | n_vec = rqst[j].rq_nvec; | |
3ab3f2a1 | 353 | |
07cd952f | 354 | size = 0; |
662bf5bc PA |
355 | for (i = 0; i < n_vec; i++) { |
356 | dump_smb(iov[i].iov_base, iov[i].iov_len); | |
07cd952f | 357 | size += iov[i].iov_len; |
662bf5bc | 358 | } |
97bc00b3 | 359 | |
aa563d7b | 360 | iov_iter_kvec(&smb_msg.msg_iter, WRITE, iov, n_vec, size); |
97bc00b3 | 361 | |
3ab3f2a1 | 362 | rc = smb_send_kvec(server, &smb_msg, &sent); |
97bc00b3 | 363 | if (rc < 0) |
b30c74c7 | 364 | goto unmask; |
97bc00b3 JL |
365 | |
366 | total_len += sent; | |
07cd952f RS |
367 | |
368 | /* now walk the page array and send each page in it */ | |
369 | for (i = 0; i < rqst[j].rq_npages; i++) { | |
370 | struct bio_vec bvec; | |
371 | ||
372 | bvec.bv_page = rqst[j].rq_pages[i]; | |
373 | rqst_page_get_length(&rqst[j], i, &bvec.bv_len, | |
374 | &bvec.bv_offset); | |
375 | ||
aa563d7b | 376 | iov_iter_bvec(&smb_msg.msg_iter, WRITE, |
07cd952f RS |
377 | &bvec, 1, bvec.bv_len); |
378 | rc = smb_send_kvec(server, &smb_msg, &sent); | |
379 | if (rc < 0) | |
380 | break; | |
381 | ||
382 | total_len += sent; | |
383 | } | |
97bc00b3 | 384 | } |
1da177e4 | 385 | |
b30c74c7 PS |
386 | unmask: |
387 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
388 | ||
389 | /* | |
390 | * If signal is pending but we have already sent the whole packet to | |
391 | * the server we need to return success status to allow a corresponding | |
392 | * mid entry to be kept in the pending requests queue thus allowing | |
393 | * to handle responses from the server by the client. | |
394 | * | |
395 | * If only part of the packet has been sent there is no need to hide | |
396 | * interrupt because the session will be reconnected anyway, so there | |
397 | * won't be any response from the server to handle. | |
398 | */ | |
399 | ||
400 | if (signal_pending(current) && (total_len != send_length)) { | |
401 | cifs_dbg(FYI, "signal is pending after attempt to send\n"); | |
402 | rc = -EINTR; | |
403 | } | |
404 | ||
b8eed283 JL |
405 | /* uncork it */ |
406 | val = 0; | |
407 | kernel_setsockopt(ssocket, SOL_TCP, TCP_CORK, | |
408 | (char *)&val, sizeof(val)); | |
409 | ||
c713c877 | 410 | if ((total_len > 0) && (total_len != send_length)) { |
f96637be | 411 | cifs_dbg(FYI, "partial send (wanted=%u sent=%zu): terminating session\n", |
c713c877 | 412 | send_length, total_len); |
6f49f46b JL |
413 | /* |
414 | * If we have only sent part of an SMB then the next SMB could | |
415 | * be taken as the remainder of this one. We need to kill the | |
416 | * socket so the server throws away the partial SMB | |
417 | */ | |
edf1ae40 | 418 | server->tcpStatus = CifsNeedReconnect; |
bf1fdeb7 SF |
419 | trace_smb3_partial_send_reconnect(server->CurrentMid, |
420 | server->hostname); | |
edf1ae40 | 421 | } |
9762c2d0 | 422 | smbd_done: |
d804d41d | 423 | if (rc < 0 && rc != -EINTR) |
f96637be JP |
424 | cifs_dbg(VFS, "Error %d sending data on socket to server\n", |
425 | rc); | |
ee13919c | 426 | else if (rc > 0) |
1da177e4 | 427 | rc = 0; |
1da177e4 LT |
428 | |
429 | return rc; | |
430 | } | |
431 | ||
6f49f46b | 432 | static int |
1f3a8f5f RS |
433 | smb_send_rqst(struct TCP_Server_Info *server, int num_rqst, |
434 | struct smb_rqst *rqst, int flags) | |
6f49f46b | 435 | { |
b2c96de7 RS |
436 | struct kvec iov; |
437 | struct smb2_transform_hdr tr_hdr; | |
438 | struct smb_rqst cur_rqst[MAX_COMPOUND]; | |
7fb8986e PS |
439 | int rc; |
440 | ||
441 | if (!(flags & CIFS_TRANSFORM_REQ)) | |
1f3a8f5f RS |
442 | return __smb_send_rqst(server, num_rqst, rqst); |
443 | ||
444 | if (num_rqst > MAX_COMPOUND - 1) | |
445 | return -ENOMEM; | |
7fb8986e | 446 | |
b2c96de7 RS |
447 | memset(&cur_rqst[0], 0, sizeof(cur_rqst)); |
448 | memset(&iov, 0, sizeof(iov)); | |
449 | memset(&tr_hdr, 0, sizeof(tr_hdr)); | |
450 | ||
451 | iov.iov_base = &tr_hdr; | |
452 | iov.iov_len = sizeof(tr_hdr); | |
453 | cur_rqst[0].rq_iov = &iov; | |
454 | cur_rqst[0].rq_nvec = 1; | |
455 | ||
456 | if (!server->ops->init_transform_rq) { | |
457 | cifs_dbg(VFS, "Encryption requested but transform callback " | |
458 | "is missing\n"); | |
7fb8986e PS |
459 | return -EIO; |
460 | } | |
6f49f46b | 461 | |
1f3a8f5f RS |
462 | rc = server->ops->init_transform_rq(server, num_rqst + 1, |
463 | &cur_rqst[0], rqst); | |
7fb8986e PS |
464 | if (rc) |
465 | return rc; | |
466 | ||
1f3a8f5f RS |
467 | rc = __smb_send_rqst(server, num_rqst + 1, &cur_rqst[0]); |
468 | smb3_free_compound_rqst(num_rqst, &cur_rqst[1]); | |
7fb8986e | 469 | return rc; |
6f49f46b JL |
470 | } |
471 | ||
0496e02d JL |
472 | int |
473 | smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer, | |
474 | unsigned int smb_buf_length) | |
475 | { | |
738f9de5 | 476 | struct kvec iov[2]; |
7fb8986e PS |
477 | struct smb_rqst rqst = { .rq_iov = iov, |
478 | .rq_nvec = 2 }; | |
0496e02d | 479 | |
738f9de5 PS |
480 | iov[0].iov_base = smb_buffer; |
481 | iov[0].iov_len = 4; | |
482 | iov[1].iov_base = (char *)smb_buffer + 4; | |
483 | iov[1].iov_len = smb_buf_length; | |
0496e02d | 484 | |
07cd952f | 485 | return __smb_send_rqst(server, 1, &rqst); |
0496e02d JL |
486 | } |
487 | ||
fc40f9cf | 488 | static int |
b227d215 | 489 | wait_for_free_credits(struct TCP_Server_Info *server, const int num_credits, |
2b53b929 RS |
490 | const int timeout, const int flags, |
491 | unsigned int *instance) | |
1da177e4 | 492 | { |
5bc59498 | 493 | int rc; |
4230cff8 RS |
494 | int *credits; |
495 | int optype; | |
2b53b929 RS |
496 | long int t; |
497 | ||
498 | if (timeout < 0) | |
499 | t = MAX_JIFFY_OFFSET; | |
500 | else | |
501 | t = msecs_to_jiffies(timeout); | |
4230cff8 RS |
502 | |
503 | optype = flags & CIFS_OP_MASK; | |
5bc59498 | 504 | |
34f4deb7 PS |
505 | *instance = 0; |
506 | ||
4230cff8 RS |
507 | credits = server->ops->get_credits_field(server, optype); |
508 | /* Since an echo is already inflight, no need to wait to send another */ | |
509 | if (*credits <= 0 && optype == CIFS_ECHO_OP) | |
510 | return -EAGAIN; | |
511 | ||
fc40f9cf | 512 | spin_lock(&server->req_lock); |
4230cff8 | 513 | if ((flags & CIFS_TIMEOUT_MASK) == CIFS_ASYNC_OP) { |
1da177e4 | 514 | /* oplock breaks must not be held up */ |
fc40f9cf | 515 | server->in_flight++; |
bc205ed1 | 516 | *credits -= 1; |
34f4deb7 | 517 | *instance = server->reconnect_instance; |
fc40f9cf | 518 | spin_unlock(&server->req_lock); |
27a97a61 VL |
519 | return 0; |
520 | } | |
521 | ||
27a97a61 | 522 | while (1) { |
b227d215 | 523 | if (*credits < num_credits) { |
fc40f9cf | 524 | spin_unlock(&server->req_lock); |
789e6661 | 525 | cifs_num_waiters_inc(server); |
2b53b929 RS |
526 | rc = wait_event_killable_timeout(server->request_q, |
527 | has_credits(server, credits, num_credits), t); | |
789e6661 | 528 | cifs_num_waiters_dec(server); |
2b53b929 | 529 | if (!rc) { |
7937ca96 SF |
530 | trace_smb3_credit_timeout(server->CurrentMid, |
531 | server->hostname, num_credits); | |
2b53b929 RS |
532 | cifs_dbg(VFS, "wait timed out after %d ms\n", |
533 | timeout); | |
534 | return -ENOTSUPP; | |
535 | } | |
536 | if (rc == -ERESTARTSYS) | |
537 | return -ERESTARTSYS; | |
fc40f9cf | 538 | spin_lock(&server->req_lock); |
27a97a61 | 539 | } else { |
c5797a94 | 540 | if (server->tcpStatus == CifsExiting) { |
fc40f9cf | 541 | spin_unlock(&server->req_lock); |
27a97a61 | 542 | return -ENOENT; |
1da177e4 | 543 | } |
27a97a61 | 544 | |
16b34aa4 RS |
545 | /* |
546 | * For normal commands, reserve the last MAX_COMPOUND | |
547 | * credits to compound requests. | |
548 | * Otherwise these compounds could be permanently | |
549 | * starved for credits by single-credit requests. | |
550 | * | |
551 | * To prevent spinning CPU, block this thread until | |
552 | * there are >MAX_COMPOUND credits available. | |
553 | * But only do this is we already have a lot of | |
554 | * credits in flight to avoid triggering this check | |
555 | * for servers that are slow to hand out credits on | |
556 | * new sessions. | |
557 | */ | |
558 | if (!optype && num_credits == 1 && | |
559 | server->in_flight > 2 * MAX_COMPOUND && | |
560 | *credits <= MAX_COMPOUND) { | |
561 | spin_unlock(&server->req_lock); | |
562 | cifs_num_waiters_inc(server); | |
2b53b929 RS |
563 | rc = wait_event_killable_timeout( |
564 | server->request_q, | |
16b34aa4 | 565 | has_credits(server, credits, |
2b53b929 RS |
566 | MAX_COMPOUND + 1), |
567 | t); | |
16b34aa4 | 568 | cifs_num_waiters_dec(server); |
2b53b929 | 569 | if (!rc) { |
7937ca96 SF |
570 | trace_smb3_credit_timeout( |
571 | server->CurrentMid, | |
572 | server->hostname, num_credits); | |
2b53b929 RS |
573 | cifs_dbg(VFS, "wait timed out after %d ms\n", |
574 | timeout); | |
575 | return -ENOTSUPP; | |
576 | } | |
577 | if (rc == -ERESTARTSYS) | |
578 | return -ERESTARTSYS; | |
16b34aa4 RS |
579 | spin_lock(&server->req_lock); |
580 | continue; | |
581 | } | |
582 | ||
2d86dbc9 PS |
583 | /* |
584 | * Can not count locking commands against total | |
585 | * as they are allowed to block on server. | |
586 | */ | |
27a97a61 VL |
587 | |
588 | /* update # of requests on the wire to server */ | |
4230cff8 | 589 | if ((flags & CIFS_TIMEOUT_MASK) != CIFS_BLOCKING_OP) { |
b227d215 RS |
590 | *credits -= num_credits; |
591 | server->in_flight += num_credits; | |
34f4deb7 | 592 | *instance = server->reconnect_instance; |
2d86dbc9 | 593 | } |
fc40f9cf | 594 | spin_unlock(&server->req_lock); |
27a97a61 | 595 | break; |
1da177e4 LT |
596 | } |
597 | } | |
7ee1af76 JA |
598 | return 0; |
599 | } | |
1da177e4 | 600 | |
bc205ed1 | 601 | static int |
480b1cb9 RS |
602 | wait_for_free_request(struct TCP_Server_Info *server, const int flags, |
603 | unsigned int *instance) | |
bc205ed1 | 604 | { |
2b53b929 RS |
605 | return wait_for_free_credits(server, 1, -1, flags, |
606 | instance); | |
bc205ed1 PS |
607 | } |
608 | ||
257b7809 RS |
609 | static int |
610 | wait_for_compound_request(struct TCP_Server_Info *server, int num, | |
611 | const int flags, unsigned int *instance) | |
612 | { | |
613 | int *credits; | |
614 | ||
615 | credits = server->ops->get_credits_field(server, flags & CIFS_OP_MASK); | |
616 | ||
617 | spin_lock(&server->req_lock); | |
618 | if (*credits < num) { | |
619 | /* | |
620 | * Return immediately if not too many requests in flight since | |
621 | * we will likely be stuck on waiting for credits. | |
622 | */ | |
623 | if (server->in_flight < num - *credits) { | |
624 | spin_unlock(&server->req_lock); | |
625 | return -ENOTSUPP; | |
626 | } | |
627 | } | |
628 | spin_unlock(&server->req_lock); | |
629 | ||
630 | return wait_for_free_credits(server, num, 60000, flags, | |
631 | instance); | |
632 | } | |
633 | ||
cb7e9eab PS |
634 | int |
635 | cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size, | |
335b7b62 | 636 | unsigned int *num, struct cifs_credits *credits) |
cb7e9eab PS |
637 | { |
638 | *num = size; | |
335b7b62 PS |
639 | credits->value = 0; |
640 | credits->instance = server->reconnect_instance; | |
cb7e9eab PS |
641 | return 0; |
642 | } | |
643 | ||
96daf2b0 | 644 | static int allocate_mid(struct cifs_ses *ses, struct smb_hdr *in_buf, |
7ee1af76 JA |
645 | struct mid_q_entry **ppmidQ) |
646 | { | |
1da177e4 | 647 | if (ses->server->tcpStatus == CifsExiting) { |
7ee1af76 | 648 | return -ENOENT; |
8fbbd365 VL |
649 | } |
650 | ||
651 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 652 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
7ee1af76 | 653 | return -EAGAIN; |
8fbbd365 VL |
654 | } |
655 | ||
7f48558e | 656 | if (ses->status == CifsNew) { |
79a58d1f | 657 | if ((in_buf->Command != SMB_COM_SESSION_SETUP_ANDX) && |
ad7a2926 | 658 | (in_buf->Command != SMB_COM_NEGOTIATE)) |
7ee1af76 | 659 | return -EAGAIN; |
ad7a2926 | 660 | /* else ok - we are setting up session */ |
1da177e4 | 661 | } |
7f48558e SP |
662 | |
663 | if (ses->status == CifsExiting) { | |
664 | /* check if SMB session is bad because we are setting it up */ | |
665 | if (in_buf->Command != SMB_COM_LOGOFF_ANDX) | |
666 | return -EAGAIN; | |
667 | /* else ok - we are shutting down session */ | |
668 | } | |
669 | ||
24b9b06b | 670 | *ppmidQ = AllocMidQEntry(in_buf, ses->server); |
26f57364 | 671 | if (*ppmidQ == NULL) |
7ee1af76 | 672 | return -ENOMEM; |
ddc8cf8f JL |
673 | spin_lock(&GlobalMid_Lock); |
674 | list_add_tail(&(*ppmidQ)->qhead, &ses->server->pending_mid_q); | |
675 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 JA |
676 | return 0; |
677 | } | |
678 | ||
0ade640e JL |
679 | static int |
680 | wait_for_response(struct TCP_Server_Info *server, struct mid_q_entry *midQ) | |
7ee1af76 | 681 | { |
0ade640e | 682 | int error; |
7ee1af76 | 683 | |
5853cc2a | 684 | error = wait_event_freezekillable_unsafe(server->response_q, |
7c9421e1 | 685 | midQ->mid_state != MID_REQUEST_SUBMITTED); |
0ade640e JL |
686 | if (error < 0) |
687 | return -ERESTARTSYS; | |
7ee1af76 | 688 | |
0ade640e | 689 | return 0; |
7ee1af76 JA |
690 | } |
691 | ||
fec344e3 JL |
692 | struct mid_q_entry * |
693 | cifs_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
792af7b0 PS |
694 | { |
695 | int rc; | |
fec344e3 | 696 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
697 | struct mid_q_entry *mid; |
698 | ||
738f9de5 PS |
699 | if (rqst->rq_iov[0].iov_len != 4 || |
700 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
701 | return ERR_PTR(-EIO); | |
702 | ||
792af7b0 | 703 | /* enable signing if server requires it */ |
38d77c50 | 704 | if (server->sign) |
792af7b0 PS |
705 | hdr->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
706 | ||
707 | mid = AllocMidQEntry(hdr, server); | |
708 | if (mid == NULL) | |
fec344e3 | 709 | return ERR_PTR(-ENOMEM); |
792af7b0 | 710 | |
fec344e3 | 711 | rc = cifs_sign_rqst(rqst, server, &mid->sequence_number); |
ffc61ccb SP |
712 | if (rc) { |
713 | DeleteMidQEntry(mid); | |
fec344e3 | 714 | return ERR_PTR(rc); |
ffc61ccb SP |
715 | } |
716 | ||
fec344e3 | 717 | return mid; |
792af7b0 | 718 | } |
133672ef | 719 | |
a6827c18 JL |
720 | /* |
721 | * Send a SMB request and set the callback function in the mid to handle | |
722 | * the result. Caller is responsible for dealing with timeouts. | |
723 | */ | |
724 | int | |
fec344e3 | 725 | cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
9b7c18a2 | 726 | mid_receive_t *receive, mid_callback_t *callback, |
3349c3a7 PS |
727 | mid_handle_t *handle, void *cbdata, const int flags, |
728 | const struct cifs_credits *exist_credits) | |
a6827c18 | 729 | { |
480b1cb9 | 730 | int rc; |
a6827c18 | 731 | struct mid_q_entry *mid; |
335b7b62 | 732 | struct cifs_credits credits = { .value = 0, .instance = 0 }; |
34f4deb7 | 733 | unsigned int instance; |
480b1cb9 | 734 | int optype; |
a6827c18 | 735 | |
a891f0f8 PS |
736 | optype = flags & CIFS_OP_MASK; |
737 | ||
cb7e9eab | 738 | if ((flags & CIFS_HAS_CREDITS) == 0) { |
480b1cb9 | 739 | rc = wait_for_free_request(server, flags, &instance); |
cb7e9eab PS |
740 | if (rc) |
741 | return rc; | |
335b7b62 | 742 | credits.value = 1; |
34f4deb7 | 743 | credits.instance = instance; |
3349c3a7 PS |
744 | } else |
745 | instance = exist_credits->instance; | |
a6827c18 JL |
746 | |
747 | mutex_lock(&server->srv_mutex); | |
3349c3a7 PS |
748 | |
749 | /* | |
750 | * We can't use credits obtained from the previous session to send this | |
751 | * request. Check if there were reconnects after we obtained credits and | |
752 | * return -EAGAIN in such cases to let callers handle it. | |
753 | */ | |
754 | if (instance != server->reconnect_instance) { | |
755 | mutex_unlock(&server->srv_mutex); | |
756 | add_credits_and_wake_if(server, &credits, optype); | |
757 | return -EAGAIN; | |
758 | } | |
759 | ||
fec344e3 JL |
760 | mid = server->ops->setup_async_request(server, rqst); |
761 | if (IS_ERR(mid)) { | |
a6827c18 | 762 | mutex_unlock(&server->srv_mutex); |
335b7b62 | 763 | add_credits_and_wake_if(server, &credits, optype); |
fec344e3 | 764 | return PTR_ERR(mid); |
a6827c18 JL |
765 | } |
766 | ||
44d22d84 | 767 | mid->receive = receive; |
a6827c18 JL |
768 | mid->callback = callback; |
769 | mid->callback_data = cbdata; | |
9b7c18a2 | 770 | mid->handle = handle; |
7c9421e1 | 771 | mid->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 772 | |
ffc61ccb SP |
773 | /* put it on the pending_mid_q */ |
774 | spin_lock(&GlobalMid_Lock); | |
775 | list_add_tail(&mid->qhead, &server->pending_mid_q); | |
776 | spin_unlock(&GlobalMid_Lock); | |
777 | ||
93d2cb6c LL |
778 | /* |
779 | * Need to store the time in mid before calling I/O. For call_async, | |
780 | * I/O response may come back and free the mid entry on another thread. | |
781 | */ | |
782 | cifs_save_when_sent(mid); | |
789e6661 | 783 | cifs_in_send_inc(server); |
1f3a8f5f | 784 | rc = smb_send_rqst(server, 1, rqst, flags); |
789e6661 | 785 | cifs_in_send_dec(server); |
ad313cb8 | 786 | |
820962dc | 787 | if (rc < 0) { |
c781af7e | 788 | revert_current_mid(server, mid->credits); |
ad313cb8 | 789 | server->sequence_number -= 2; |
820962dc RV |
790 | cifs_delete_mid(mid); |
791 | } | |
792 | ||
a6827c18 | 793 | mutex_unlock(&server->srv_mutex); |
789e6661 | 794 | |
ffc61ccb SP |
795 | if (rc == 0) |
796 | return 0; | |
a6827c18 | 797 | |
335b7b62 | 798 | add_credits_and_wake_if(server, &credits, optype); |
a6827c18 JL |
799 | return rc; |
800 | } | |
801 | ||
133672ef SF |
802 | /* |
803 | * | |
804 | * Send an SMB Request. No response info (other than return code) | |
805 | * needs to be parsed. | |
806 | * | |
807 | * flags indicate the type of request buffer and how long to wait | |
808 | * and whether to log NT STATUS code (error) before mapping it to POSIX error | |
809 | * | |
810 | */ | |
811 | int | |
96daf2b0 | 812 | SendReceiveNoRsp(const unsigned int xid, struct cifs_ses *ses, |
792af7b0 | 813 | char *in_buf, int flags) |
133672ef SF |
814 | { |
815 | int rc; | |
816 | struct kvec iov[1]; | |
da502f7d | 817 | struct kvec rsp_iov; |
133672ef SF |
818 | int resp_buf_type; |
819 | ||
792af7b0 PS |
820 | iov[0].iov_base = in_buf; |
821 | iov[0].iov_len = get_rfc1002_length(in_buf) + 4; | |
133672ef | 822 | flags |= CIFS_NO_RESP; |
da502f7d | 823 | rc = SendReceive2(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); |
f96637be | 824 | cifs_dbg(NOISY, "SendRcvNoRsp flags %d rc %d\n", flags, rc); |
90c81e0b | 825 | |
133672ef SF |
826 | return rc; |
827 | } | |
828 | ||
053d5034 | 829 | static int |
3c1105df | 830 | cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server) |
053d5034 JL |
831 | { |
832 | int rc = 0; | |
833 | ||
f96637be JP |
834 | cifs_dbg(FYI, "%s: cmd=%d mid=%llu state=%d\n", |
835 | __func__, le16_to_cpu(mid->command), mid->mid, mid->mid_state); | |
053d5034 | 836 | |
74dd92a8 | 837 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 838 | switch (mid->mid_state) { |
74dd92a8 | 839 | case MID_RESPONSE_RECEIVED: |
053d5034 JL |
840 | spin_unlock(&GlobalMid_Lock); |
841 | return rc; | |
74dd92a8 JL |
842 | case MID_RETRY_NEEDED: |
843 | rc = -EAGAIN; | |
844 | break; | |
71823baf JL |
845 | case MID_RESPONSE_MALFORMED: |
846 | rc = -EIO; | |
847 | break; | |
3c1105df JL |
848 | case MID_SHUTDOWN: |
849 | rc = -EHOSTDOWN; | |
850 | break; | |
74dd92a8 | 851 | default: |
3c1105df | 852 | list_del_init(&mid->qhead); |
f96637be JP |
853 | cifs_dbg(VFS, "%s: invalid mid state mid=%llu state=%d\n", |
854 | __func__, mid->mid, mid->mid_state); | |
74dd92a8 | 855 | rc = -EIO; |
053d5034 JL |
856 | } |
857 | spin_unlock(&GlobalMid_Lock); | |
858 | ||
2b84a36c | 859 | DeleteMidQEntry(mid); |
053d5034 JL |
860 | return rc; |
861 | } | |
862 | ||
121b046a | 863 | static inline int |
fb2036d8 PS |
864 | send_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, |
865 | struct mid_q_entry *mid) | |
76dcc26f | 866 | { |
121b046a | 867 | return server->ops->send_cancel ? |
fb2036d8 | 868 | server->ops->send_cancel(server, rqst, mid) : 0; |
76dcc26f JL |
869 | } |
870 | ||
2c8f981d JL |
871 | int |
872 | cifs_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
873 | bool log_error) | |
874 | { | |
792af7b0 | 875 | unsigned int len = get_rfc1002_length(mid->resp_buf) + 4; |
826a95e4 JL |
876 | |
877 | dump_smb(mid->resp_buf, min_t(u32, 92, len)); | |
2c8f981d JL |
878 | |
879 | /* convert the length into a more usable form */ | |
38d77c50 | 880 | if (server->sign) { |
738f9de5 | 881 | struct kvec iov[2]; |
985e4ff0 | 882 | int rc = 0; |
738f9de5 PS |
883 | struct smb_rqst rqst = { .rq_iov = iov, |
884 | .rq_nvec = 2 }; | |
826a95e4 | 885 | |
738f9de5 PS |
886 | iov[0].iov_base = mid->resp_buf; |
887 | iov[0].iov_len = 4; | |
888 | iov[1].iov_base = (char *)mid->resp_buf + 4; | |
889 | iov[1].iov_len = len - 4; | |
2c8f981d | 890 | /* FIXME: add code to kill session */ |
bf5ea0e2 | 891 | rc = cifs_verify_signature(&rqst, server, |
0124cc45 | 892 | mid->sequence_number); |
985e4ff0 | 893 | if (rc) |
f96637be JP |
894 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
895 | rc); | |
2c8f981d JL |
896 | } |
897 | ||
898 | /* BB special case reconnect tid and uid here? */ | |
899 | return map_smb_to_linux_error(mid->resp_buf, log_error); | |
900 | } | |
901 | ||
fec344e3 JL |
902 | struct mid_q_entry * |
903 | cifs_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
792af7b0 PS |
904 | { |
905 | int rc; | |
fec344e3 | 906 | struct smb_hdr *hdr = (struct smb_hdr *)rqst->rq_iov[0].iov_base; |
792af7b0 PS |
907 | struct mid_q_entry *mid; |
908 | ||
738f9de5 PS |
909 | if (rqst->rq_iov[0].iov_len != 4 || |
910 | rqst->rq_iov[0].iov_base + 4 != rqst->rq_iov[1].iov_base) | |
911 | return ERR_PTR(-EIO); | |
912 | ||
792af7b0 PS |
913 | rc = allocate_mid(ses, hdr, &mid); |
914 | if (rc) | |
fec344e3 JL |
915 | return ERR_PTR(rc); |
916 | rc = cifs_sign_rqst(rqst, ses->server, &mid->sequence_number); | |
917 | if (rc) { | |
3c1bf7e4 | 918 | cifs_delete_mid(mid); |
fec344e3 JL |
919 | return ERR_PTR(rc); |
920 | } | |
921 | return mid; | |
792af7b0 PS |
922 | } |
923 | ||
4e34feb5 | 924 | static void |
ee258d79 | 925 | cifs_compound_callback(struct mid_q_entry *mid) |
8a26f0f7 PS |
926 | { |
927 | struct TCP_Server_Info *server = mid->server; | |
34f4deb7 PS |
928 | struct cifs_credits credits; |
929 | ||
930 | credits.value = server->ops->get_credits(mid); | |
931 | credits.instance = server->reconnect_instance; | |
8a26f0f7 | 932 | |
34f4deb7 | 933 | add_credits(server, &credits, mid->optype); |
8a26f0f7 PS |
934 | } |
935 | ||
ee258d79 PS |
936 | static void |
937 | cifs_compound_last_callback(struct mid_q_entry *mid) | |
938 | { | |
939 | cifs_compound_callback(mid); | |
940 | cifs_wake_up_task(mid); | |
941 | } | |
942 | ||
943 | static void | |
944 | cifs_cancelled_callback(struct mid_q_entry *mid) | |
945 | { | |
946 | cifs_compound_callback(mid); | |
947 | DeleteMidQEntry(mid); | |
948 | } | |
949 | ||
b8f57ee8 | 950 | int |
e0bba0b8 RS |
951 | compound_send_recv(const unsigned int xid, struct cifs_ses *ses, |
952 | const int flags, const int num_rqst, struct smb_rqst *rqst, | |
953 | int *resp_buf_type, struct kvec *resp_iov) | |
7ee1af76 | 954 | { |
480b1cb9 | 955 | int i, j, optype, rc = 0; |
e0bba0b8 | 956 | struct mid_q_entry *midQ[MAX_COMPOUND]; |
8544f4aa | 957 | bool cancelled_mid[MAX_COMPOUND] = {false}; |
34f4deb7 PS |
958 | struct cifs_credits credits[MAX_COMPOUND] = { |
959 | { .value = 0, .instance = 0 } | |
960 | }; | |
961 | unsigned int instance; | |
738f9de5 | 962 | char *buf; |
50c2f753 | 963 | |
a891f0f8 | 964 | optype = flags & CIFS_OP_MASK; |
133672ef | 965 | |
e0bba0b8 RS |
966 | for (i = 0; i < num_rqst; i++) |
967 | resp_buf_type[i] = CIFS_NO_BUFFER; /* no response buf yet */ | |
7ee1af76 JA |
968 | |
969 | if ((ses == NULL) || (ses->server == NULL)) { | |
f96637be | 970 | cifs_dbg(VFS, "Null session\n"); |
7ee1af76 JA |
971 | return -EIO; |
972 | } | |
973 | ||
da502f7d | 974 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 | 975 | return -ENOENT; |
7ee1af76 | 976 | |
792af7b0 | 977 | /* |
257b7809 | 978 | * Wait for all the requests to become available. |
7091bcab PS |
979 | * This approach still leaves the possibility to be stuck waiting for |
980 | * credits if the server doesn't grant credits to the outstanding | |
257b7809 RS |
981 | * requests and if the client is completely idle, not generating any |
982 | * other requests. | |
983 | * This can be handled by the eventual session reconnect. | |
792af7b0 | 984 | */ |
257b7809 RS |
985 | rc = wait_for_compound_request(ses->server, num_rqst, flags, |
986 | &instance); | |
987 | if (rc) | |
988 | return rc; | |
97ea4998 | 989 | |
257b7809 RS |
990 | for (i = 0; i < num_rqst; i++) { |
991 | credits[i].value = 1; | |
992 | credits[i].instance = instance; | |
8544f4aa | 993 | } |
7ee1af76 | 994 | |
792af7b0 PS |
995 | /* |
996 | * Make sure that we sign in the same order that we send on this socket | |
997 | * and avoid races inside tcp sendmsg code that could cause corruption | |
998 | * of smb data. | |
999 | */ | |
7ee1af76 | 1000 | |
72ca545b | 1001 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 | 1002 | |
97ea4998 PS |
1003 | /* |
1004 | * All the parts of the compound chain belong obtained credits from the | |
257b7809 | 1005 | * same session. We can not use credits obtained from the previous |
97ea4998 PS |
1006 | * session to send this request. Check if there were reconnects after |
1007 | * we obtained credits and return -EAGAIN in such cases to let callers | |
1008 | * handle it. | |
1009 | */ | |
257b7809 | 1010 | if (instance != ses->server->reconnect_instance) { |
97ea4998 PS |
1011 | mutex_unlock(&ses->server->srv_mutex); |
1012 | for (j = 0; j < num_rqst; j++) | |
1013 | add_credits(ses->server, &credits[j], optype); | |
1014 | return -EAGAIN; | |
1015 | } | |
1016 | ||
e0bba0b8 RS |
1017 | for (i = 0; i < num_rqst; i++) { |
1018 | midQ[i] = ses->server->ops->setup_request(ses, &rqst[i]); | |
1019 | if (IS_ERR(midQ[i])) { | |
c781af7e | 1020 | revert_current_mid(ses->server, i); |
e0bba0b8 RS |
1021 | for (j = 0; j < i; j++) |
1022 | cifs_delete_mid(midQ[j]); | |
1023 | mutex_unlock(&ses->server->srv_mutex); | |
8544f4aa | 1024 | |
e0bba0b8 | 1025 | /* Update # of requests on wire to server */ |
8544f4aa | 1026 | for (j = 0; j < num_rqst; j++) |
34f4deb7 | 1027 | add_credits(ses->server, &credits[j], optype); |
e0bba0b8 RS |
1028 | return PTR_ERR(midQ[i]); |
1029 | } | |
1030 | ||
1031 | midQ[i]->mid_state = MID_REQUEST_SUBMITTED; | |
8a26f0f7 | 1032 | midQ[i]->optype = optype; |
4e34feb5 | 1033 | /* |
ee258d79 PS |
1034 | * Invoke callback for every part of the compound chain |
1035 | * to calculate credits properly. Wake up this thread only when | |
1036 | * the last element is received. | |
4e34feb5 RS |
1037 | */ |
1038 | if (i < num_rqst - 1) | |
ee258d79 PS |
1039 | midQ[i]->callback = cifs_compound_callback; |
1040 | else | |
1041 | midQ[i]->callback = cifs_compound_last_callback; | |
1da177e4 | 1042 | } |
789e6661 | 1043 | cifs_in_send_inc(ses->server); |
e0bba0b8 | 1044 | rc = smb_send_rqst(ses->server, num_rqst, rqst, flags); |
789e6661 | 1045 | cifs_in_send_dec(ses->server); |
e0bba0b8 RS |
1046 | |
1047 | for (i = 0; i < num_rqst; i++) | |
1048 | cifs_save_when_sent(midQ[i]); | |
7ee1af76 | 1049 | |
c781af7e PS |
1050 | if (rc < 0) { |
1051 | revert_current_mid(ses->server, num_rqst); | |
ad313cb8 | 1052 | ses->server->sequence_number -= 2; |
c781af7e | 1053 | } |
e0bba0b8 | 1054 | |
72ca545b | 1055 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1056 | |
ee258d79 PS |
1057 | if (rc < 0) { |
1058 | /* Sending failed for some reason - return credits back */ | |
1059 | for (i = 0; i < num_rqst; i++) | |
34f4deb7 | 1060 | add_credits(ses->server, &credits[i], optype); |
cb5c2e63 | 1061 | goto out; |
ee258d79 PS |
1062 | } |
1063 | ||
1064 | /* | |
1065 | * At this point the request is passed to the network stack - we assume | |
1066 | * that any credits taken from the server structure on the client have | |
1067 | * been spent and we can't return them back. Once we receive responses | |
1068 | * we will collect credits granted by the server in the mid callbacks | |
1069 | * and add those credits to the server structure. | |
1070 | */ | |
e0bba0b8 | 1071 | |
cb5c2e63 RS |
1072 | /* |
1073 | * Compounding is never used during session establish. | |
1074 | */ | |
1075 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) | |
1076 | smb311_update_preauth_hash(ses, rqst[0].rq_iov, | |
1077 | rqst[0].rq_nvec); | |
e0bba0b8 | 1078 | |
480b1cb9 | 1079 | if ((flags & CIFS_TIMEOUT_MASK) == CIFS_ASYNC_OP) |
cb5c2e63 | 1080 | goto out; |
e0bba0b8 | 1081 | |
cb5c2e63 | 1082 | for (i = 0; i < num_rqst; i++) { |
e0bba0b8 | 1083 | rc = wait_for_response(ses->server, midQ[i]); |
8a26f0f7 PS |
1084 | if (rc != 0) |
1085 | break; | |
1086 | } | |
1087 | if (rc != 0) { | |
1088 | for (; i < num_rqst; i++) { | |
43de1db3 SF |
1089 | cifs_dbg(VFS, "Cancelling wait for mid %llu cmd: %d\n", |
1090 | midQ[i]->mid, le16_to_cpu(midQ[i]->command)); | |
e0bba0b8 RS |
1091 | send_cancel(ses->server, &rqst[i], midQ[i]); |
1092 | spin_lock(&GlobalMid_Lock); | |
1093 | if (midQ[i]->mid_state == MID_REQUEST_SUBMITTED) { | |
1094 | midQ[i]->mid_flags |= MID_WAIT_CANCELLED; | |
8a26f0f7 | 1095 | midQ[i]->callback = cifs_cancelled_callback; |
8544f4aa | 1096 | cancelled_mid[i] = true; |
34f4deb7 | 1097 | credits[i].value = 0; |
e0bba0b8 | 1098 | } |
1be912dd | 1099 | spin_unlock(&GlobalMid_Lock); |
e0bba0b8 | 1100 | } |
cb5c2e63 RS |
1101 | } |
1102 | ||
cb5c2e63 RS |
1103 | for (i = 0; i < num_rqst; i++) { |
1104 | if (rc < 0) | |
1105 | goto out; | |
e0bba0b8 RS |
1106 | |
1107 | rc = cifs_sync_mid_result(midQ[i], ses->server); | |
1108 | if (rc != 0) { | |
8544f4aa PS |
1109 | /* mark this mid as cancelled to not free it below */ |
1110 | cancelled_mid[i] = true; | |
1111 | goto out; | |
1be912dd | 1112 | } |
2b2bdfba | 1113 | |
e0bba0b8 RS |
1114 | if (!midQ[i]->resp_buf || |
1115 | midQ[i]->mid_state != MID_RESPONSE_RECEIVED) { | |
1116 | rc = -EIO; | |
1117 | cifs_dbg(FYI, "Bad MID state?\n"); | |
1118 | goto out; | |
1119 | } | |
a891f0f8 | 1120 | |
e0bba0b8 RS |
1121 | buf = (char *)midQ[i]->resp_buf; |
1122 | resp_iov[i].iov_base = buf; | |
1123 | resp_iov[i].iov_len = midQ[i]->resp_buf_size + | |
1124 | ses->server->vals->header_preamble_size; | |
1125 | ||
1126 | if (midQ[i]->large_buf) | |
1127 | resp_buf_type[i] = CIFS_LARGE_BUFFER; | |
1128 | else | |
1129 | resp_buf_type[i] = CIFS_SMALL_BUFFER; | |
1130 | ||
e0bba0b8 RS |
1131 | rc = ses->server->ops->check_receive(midQ[i], ses->server, |
1132 | flags & CIFS_LOG_ERROR); | |
1da177e4 | 1133 | |
e0bba0b8 RS |
1134 | /* mark it so buf will not be freed by cifs_delete_mid */ |
1135 | if ((flags & CIFS_NO_RESP) == 0) | |
1136 | midQ[i]->resp_buf = NULL; | |
cb5c2e63 | 1137 | |
e0bba0b8 | 1138 | } |
cb5c2e63 RS |
1139 | |
1140 | /* | |
1141 | * Compounding is never used during session establish. | |
1142 | */ | |
1143 | if ((ses->status == CifsNew) || (optype & CIFS_NEG_OP)) { | |
1144 | struct kvec iov = { | |
1145 | .iov_base = resp_iov[0].iov_base, | |
1146 | .iov_len = resp_iov[0].iov_len | |
1147 | }; | |
1148 | smb311_update_preauth_hash(ses, &iov, 1); | |
1149 | } | |
1150 | ||
7ee1af76 | 1151 | out: |
4e34feb5 RS |
1152 | /* |
1153 | * This will dequeue all mids. After this it is important that the | |
1154 | * demultiplex_thread will not process any of these mids any futher. | |
1155 | * This is prevented above by using a noop callback that will not | |
1156 | * wake this thread except for the very last PDU. | |
1157 | */ | |
8544f4aa PS |
1158 | for (i = 0; i < num_rqst; i++) { |
1159 | if (!cancelled_mid[i]) | |
1160 | cifs_delete_mid(midQ[i]); | |
8544f4aa | 1161 | } |
1da177e4 | 1162 | |
d6e04ae6 SF |
1163 | return rc; |
1164 | } | |
1da177e4 | 1165 | |
e0bba0b8 RS |
1166 | int |
1167 | cifs_send_recv(const unsigned int xid, struct cifs_ses *ses, | |
1168 | struct smb_rqst *rqst, int *resp_buf_type, const int flags, | |
1169 | struct kvec *resp_iov) | |
1170 | { | |
1171 | return compound_send_recv(xid, ses, flags, 1, rqst, resp_buf_type, | |
1172 | resp_iov); | |
1173 | } | |
1174 | ||
738f9de5 PS |
1175 | int |
1176 | SendReceive2(const unsigned int xid, struct cifs_ses *ses, | |
1177 | struct kvec *iov, int n_vec, int *resp_buf_type /* ret */, | |
1178 | const int flags, struct kvec *resp_iov) | |
1179 | { | |
1180 | struct smb_rqst rqst; | |
3cecf486 | 1181 | struct kvec s_iov[CIFS_MAX_IOV_SIZE], *new_iov; |
738f9de5 PS |
1182 | int rc; |
1183 | ||
3cecf486 | 1184 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) { |
6da2ec56 KC |
1185 | new_iov = kmalloc_array(n_vec + 1, sizeof(struct kvec), |
1186 | GFP_KERNEL); | |
117e3b7f SF |
1187 | if (!new_iov) { |
1188 | /* otherwise cifs_send_recv below sets resp_buf_type */ | |
1189 | *resp_buf_type = CIFS_NO_BUFFER; | |
3cecf486 | 1190 | return -ENOMEM; |
117e3b7f | 1191 | } |
3cecf486 RS |
1192 | } else |
1193 | new_iov = s_iov; | |
738f9de5 PS |
1194 | |
1195 | /* 1st iov is a RFC1001 length followed by the rest of the packet */ | |
1196 | memcpy(new_iov + 1, iov, (sizeof(struct kvec) * n_vec)); | |
1197 | ||
1198 | new_iov[0].iov_base = new_iov[1].iov_base; | |
1199 | new_iov[0].iov_len = 4; | |
1200 | new_iov[1].iov_base += 4; | |
1201 | new_iov[1].iov_len -= 4; | |
1202 | ||
1203 | memset(&rqst, 0, sizeof(struct smb_rqst)); | |
1204 | rqst.rq_iov = new_iov; | |
1205 | rqst.rq_nvec = n_vec + 1; | |
1206 | ||
1207 | rc = cifs_send_recv(xid, ses, &rqst, resp_buf_type, flags, resp_iov); | |
3cecf486 RS |
1208 | if (n_vec + 1 > CIFS_MAX_IOV_SIZE) |
1209 | kfree(new_iov); | |
738f9de5 PS |
1210 | return rc; |
1211 | } | |
1212 | ||
1da177e4 | 1213 | int |
96daf2b0 | 1214 | SendReceive(const unsigned int xid, struct cifs_ses *ses, |
1da177e4 | 1215 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
480b1cb9 | 1216 | int *pbytes_returned, const int flags) |
1da177e4 LT |
1217 | { |
1218 | int rc = 0; | |
1da177e4 | 1219 | struct mid_q_entry *midQ; |
fb2036d8 PS |
1220 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1221 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1222 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1223 | struct cifs_credits credits = { .value = 1, .instance = 0 }; |
1da177e4 LT |
1224 | |
1225 | if (ses == NULL) { | |
f96637be | 1226 | cifs_dbg(VFS, "Null smb session\n"); |
1da177e4 LT |
1227 | return -EIO; |
1228 | } | |
79a58d1f | 1229 | if (ses->server == NULL) { |
f96637be | 1230 | cifs_dbg(VFS, "Null tcp session\n"); |
1da177e4 LT |
1231 | return -EIO; |
1232 | } | |
1233 | ||
79a58d1f | 1234 | if (ses->server->tcpStatus == CifsExiting) |
31ca3bc3 SF |
1235 | return -ENOENT; |
1236 | ||
79a58d1f | 1237 | /* Ensure that we do not send more than 50 overlapping requests |
1da177e4 LT |
1238 | to the same server. We may make this configurable later or |
1239 | use ses->maxReq */ | |
1da177e4 | 1240 | |
fb2036d8 | 1241 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1242 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1243 | len); |
6d9c6d54 VL |
1244 | return -EIO; |
1245 | } | |
1246 | ||
480b1cb9 | 1247 | rc = wait_for_free_request(ses->server, flags, &credits.instance); |
7ee1af76 JA |
1248 | if (rc) |
1249 | return rc; | |
1250 | ||
79a58d1f | 1251 | /* make sure that we sign in the same order that we send on this socket |
1da177e4 LT |
1252 | and avoid races inside tcp sendmsg code that could cause corruption |
1253 | of smb data */ | |
1254 | ||
72ca545b | 1255 | mutex_lock(&ses->server->srv_mutex); |
1da177e4 | 1256 | |
7ee1af76 JA |
1257 | rc = allocate_mid(ses, in_buf, &midQ); |
1258 | if (rc) { | |
72ca545b | 1259 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1260 | /* Update # of requests on wire to server */ |
34f4deb7 | 1261 | add_credits(ses->server, &credits, 0); |
7ee1af76 | 1262 | return rc; |
1da177e4 LT |
1263 | } |
1264 | ||
ad009ac9 | 1265 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb VL |
1266 | if (rc) { |
1267 | mutex_unlock(&ses->server->srv_mutex); | |
1268 | goto out; | |
1269 | } | |
1da177e4 | 1270 | |
7c9421e1 | 1271 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 SF |
1272 | |
1273 | cifs_in_send_inc(ses->server); | |
fb2036d8 | 1274 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1275 | cifs_in_send_dec(ses->server); |
1276 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1277 | |
1278 | if (rc < 0) | |
1279 | ses->server->sequence_number -= 2; | |
1280 | ||
72ca545b | 1281 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1282 | |
79a58d1f | 1283 | if (rc < 0) |
7ee1af76 JA |
1284 | goto out; |
1285 | ||
480b1cb9 | 1286 | if ((flags & CIFS_TIMEOUT_MASK) == CIFS_ASYNC_OP) |
7ee1af76 | 1287 | goto out; |
1da177e4 | 1288 | |
0ade640e | 1289 | rc = wait_for_response(ses->server, midQ); |
1be912dd | 1290 | if (rc != 0) { |
fb2036d8 | 1291 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1292 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1293 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1294 | /* no longer considered to be "in-flight" */ |
1295 | midQ->callback = DeleteMidQEntry; | |
1296 | spin_unlock(&GlobalMid_Lock); | |
34f4deb7 | 1297 | add_credits(ses->server, &credits, 0); |
1be912dd JL |
1298 | return rc; |
1299 | } | |
1300 | spin_unlock(&GlobalMid_Lock); | |
1301 | } | |
1da177e4 | 1302 | |
3c1105df | 1303 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1304 | if (rc != 0) { |
34f4deb7 | 1305 | add_credits(ses->server, &credits, 0); |
1da177e4 LT |
1306 | return rc; |
1307 | } | |
50c2f753 | 1308 | |
2c8f981d | 1309 | if (!midQ->resp_buf || !out_buf || |
7c9421e1 | 1310 | midQ->mid_state != MID_RESPONSE_RECEIVED) { |
2b2bdfba | 1311 | rc = -EIO; |
f96637be | 1312 | cifs_dbg(VFS, "Bad MID state?\n"); |
2c8f981d | 1313 | goto out; |
1da177e4 | 1314 | } |
7ee1af76 | 1315 | |
d4e4854f | 1316 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1317 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1318 | rc = cifs_check_receive(midQ, ses->server, 0); | |
7ee1af76 | 1319 | out: |
3c1bf7e4 | 1320 | cifs_delete_mid(midQ); |
34f4deb7 | 1321 | add_credits(ses->server, &credits, 0); |
1da177e4 | 1322 | |
7ee1af76 JA |
1323 | return rc; |
1324 | } | |
1da177e4 | 1325 | |
7ee1af76 JA |
1326 | /* We send a LOCKINGX_CANCEL_LOCK to cause the Windows |
1327 | blocking lock to return. */ | |
1328 | ||
1329 | static int | |
96daf2b0 | 1330 | send_lock_cancel(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1331 | struct smb_hdr *in_buf, |
1332 | struct smb_hdr *out_buf) | |
1333 | { | |
1334 | int bytes_returned; | |
96daf2b0 | 1335 | struct cifs_ses *ses = tcon->ses; |
7ee1af76 JA |
1336 | LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; |
1337 | ||
1338 | /* We just modify the current in_buf to change | |
1339 | the type of lock from LOCKING_ANDX_SHARED_LOCK | |
1340 | or LOCKING_ANDX_EXCLUSIVE_LOCK to | |
1341 | LOCKING_ANDX_CANCEL_LOCK. */ | |
1342 | ||
1343 | pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; | |
1344 | pSMB->Timeout = 0; | |
88257360 | 1345 | pSMB->hdr.Mid = get_next_mid(ses->server); |
7ee1af76 JA |
1346 | |
1347 | return SendReceive(xid, ses, in_buf, out_buf, | |
7749981e | 1348 | &bytes_returned, 0); |
7ee1af76 JA |
1349 | } |
1350 | ||
1351 | int | |
96daf2b0 | 1352 | SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon, |
7ee1af76 JA |
1353 | struct smb_hdr *in_buf, struct smb_hdr *out_buf, |
1354 | int *pbytes_returned) | |
1355 | { | |
1356 | int rc = 0; | |
1357 | int rstart = 0; | |
7ee1af76 | 1358 | struct mid_q_entry *midQ; |
96daf2b0 | 1359 | struct cifs_ses *ses; |
fb2036d8 PS |
1360 | unsigned int len = be32_to_cpu(in_buf->smb_buf_length); |
1361 | struct kvec iov = { .iov_base = in_buf, .iov_len = len }; | |
1362 | struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 }; | |
34f4deb7 | 1363 | unsigned int instance; |
7ee1af76 JA |
1364 | |
1365 | if (tcon == NULL || tcon->ses == NULL) { | |
f96637be | 1366 | cifs_dbg(VFS, "Null smb session\n"); |
7ee1af76 JA |
1367 | return -EIO; |
1368 | } | |
1369 | ses = tcon->ses; | |
1370 | ||
79a58d1f | 1371 | if (ses->server == NULL) { |
f96637be | 1372 | cifs_dbg(VFS, "Null tcp session\n"); |
7ee1af76 JA |
1373 | return -EIO; |
1374 | } | |
1375 | ||
79a58d1f | 1376 | if (ses->server->tcpStatus == CifsExiting) |
7ee1af76 JA |
1377 | return -ENOENT; |
1378 | ||
79a58d1f | 1379 | /* Ensure that we do not send more than 50 overlapping requests |
7ee1af76 JA |
1380 | to the same server. We may make this configurable later or |
1381 | use ses->maxReq */ | |
1382 | ||
fb2036d8 | 1383 | if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { |
f96637be | 1384 | cifs_dbg(VFS, "Illegal length, greater than maximum frame, %d\n", |
fb2036d8 | 1385 | len); |
6d9c6d54 VL |
1386 | return -EIO; |
1387 | } | |
1388 | ||
480b1cb9 | 1389 | rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP, &instance); |
7ee1af76 JA |
1390 | if (rc) |
1391 | return rc; | |
1392 | ||
79a58d1f | 1393 | /* make sure that we sign in the same order that we send on this socket |
7ee1af76 JA |
1394 | and avoid races inside tcp sendmsg code that could cause corruption |
1395 | of smb data */ | |
1396 | ||
72ca545b | 1397 | mutex_lock(&ses->server->srv_mutex); |
7ee1af76 JA |
1398 | |
1399 | rc = allocate_mid(ses, in_buf, &midQ); | |
1400 | if (rc) { | |
72ca545b | 1401 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 JA |
1402 | return rc; |
1403 | } | |
1404 | ||
7ee1af76 | 1405 | rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number); |
829049cb | 1406 | if (rc) { |
3c1bf7e4 | 1407 | cifs_delete_mid(midQ); |
829049cb VL |
1408 | mutex_unlock(&ses->server->srv_mutex); |
1409 | return rc; | |
1410 | } | |
1da177e4 | 1411 | |
7c9421e1 | 1412 | midQ->mid_state = MID_REQUEST_SUBMITTED; |
789e6661 | 1413 | cifs_in_send_inc(ses->server); |
fb2036d8 | 1414 | rc = smb_send(ses->server, in_buf, len); |
789e6661 SF |
1415 | cifs_in_send_dec(ses->server); |
1416 | cifs_save_when_sent(midQ); | |
ad313cb8 JL |
1417 | |
1418 | if (rc < 0) | |
1419 | ses->server->sequence_number -= 2; | |
1420 | ||
72ca545b | 1421 | mutex_unlock(&ses->server->srv_mutex); |
7ee1af76 | 1422 | |
79a58d1f | 1423 | if (rc < 0) { |
3c1bf7e4 | 1424 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1425 | return rc; |
1426 | } | |
1427 | ||
1428 | /* Wait for a reply - allow signals to interrupt. */ | |
1429 | rc = wait_event_interruptible(ses->server->response_q, | |
7c9421e1 | 1430 | (!(midQ->mid_state == MID_REQUEST_SUBMITTED)) || |
7ee1af76 JA |
1431 | ((ses->server->tcpStatus != CifsGood) && |
1432 | (ses->server->tcpStatus != CifsNew))); | |
1433 | ||
1434 | /* Were we interrupted by a signal ? */ | |
1435 | if ((rc == -ERESTARTSYS) && | |
7c9421e1 | 1436 | (midQ->mid_state == MID_REQUEST_SUBMITTED) && |
7ee1af76 JA |
1437 | ((ses->server->tcpStatus == CifsGood) || |
1438 | (ses->server->tcpStatus == CifsNew))) { | |
1439 | ||
1440 | if (in_buf->Command == SMB_COM_TRANSACTION2) { | |
1441 | /* POSIX lock. We send a NT_CANCEL SMB to cause the | |
1442 | blocking lock to return. */ | |
fb2036d8 | 1443 | rc = send_cancel(ses->server, &rqst, midQ); |
7ee1af76 | 1444 | if (rc) { |
3c1bf7e4 | 1445 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1446 | return rc; |
1447 | } | |
1448 | } else { | |
1449 | /* Windows lock. We send a LOCKINGX_CANCEL_LOCK | |
1450 | to cause the blocking lock to return. */ | |
1451 | ||
1452 | rc = send_lock_cancel(xid, tcon, in_buf, out_buf); | |
1453 | ||
1454 | /* If we get -ENOLCK back the lock may have | |
1455 | already been removed. Don't exit in this case. */ | |
1456 | if (rc && rc != -ENOLCK) { | |
3c1bf7e4 | 1457 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1458 | return rc; |
1459 | } | |
1460 | } | |
1461 | ||
1be912dd JL |
1462 | rc = wait_for_response(ses->server, midQ); |
1463 | if (rc) { | |
fb2036d8 | 1464 | send_cancel(ses->server, &rqst, midQ); |
1be912dd | 1465 | spin_lock(&GlobalMid_Lock); |
7c9421e1 | 1466 | if (midQ->mid_state == MID_REQUEST_SUBMITTED) { |
1be912dd JL |
1467 | /* no longer considered to be "in-flight" */ |
1468 | midQ->callback = DeleteMidQEntry; | |
1469 | spin_unlock(&GlobalMid_Lock); | |
1470 | return rc; | |
1471 | } | |
1472 | spin_unlock(&GlobalMid_Lock); | |
7ee1af76 | 1473 | } |
1be912dd JL |
1474 | |
1475 | /* We got the response - restart system call. */ | |
1476 | rstart = 1; | |
7ee1af76 JA |
1477 | } |
1478 | ||
3c1105df | 1479 | rc = cifs_sync_mid_result(midQ, ses->server); |
053d5034 | 1480 | if (rc != 0) |
7ee1af76 | 1481 | return rc; |
50c2f753 | 1482 | |
17c8bfed | 1483 | /* rcvd frame is ok */ |
7c9421e1 | 1484 | if (out_buf == NULL || midQ->mid_state != MID_RESPONSE_RECEIVED) { |
698e96a8 | 1485 | rc = -EIO; |
f96637be | 1486 | cifs_dbg(VFS, "Bad MID state?\n"); |
698e96a8 VL |
1487 | goto out; |
1488 | } | |
1da177e4 | 1489 | |
d4e4854f | 1490 | *pbytes_returned = get_rfc1002_length(midQ->resp_buf); |
2c8f981d JL |
1491 | memcpy(out_buf, midQ->resp_buf, *pbytes_returned + 4); |
1492 | rc = cifs_check_receive(midQ, ses->server, 0); | |
17c8bfed | 1493 | out: |
3c1bf7e4 | 1494 | cifs_delete_mid(midQ); |
7ee1af76 JA |
1495 | if (rstart && rc == -EACCES) |
1496 | return -ERESTARTSYS; | |
1da177e4 LT |
1497 | return rc; |
1498 | } |